On this Solemnity of Saints Peter and Paul, here is an appropriate homily by Saint Leo the Great.
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When the twelve Apostles, after receiving through the Holy Spirit the power of speaking with all tongues, had distributed the world into parts among themselves, and undertaken to instruct it in the Gospel, the most blessed Peter, chief of the Apostolic band, was appointed to the citadel of the Roman empire, that the light of Truth which was being displayed for the salvation of all the nations, might spread itself more effectively throughout the body of the world from the head itself. What nation had not representatives then living in this city; or what peoples did not know what Rome had learned? Here it was that the tenets of philosophy must be crushed, here that the follies of earthly wisdom must be dispelled, here that the cult of demons must be refuted, here that the blasphemy of all idolatries must be rooted out, here where the most persistent superstition had gathered together all the various errors which had anywhere been devised.
To this city then, most blessed Apostle Peter, you do not fear to come, and when the Apostle Paul, the partner of your glory, was still busied with regulating other churches, entered this forest of roaring beasts, this deep, stormy ocean with greater boldness than when you walked upon the sea. And you who had been frightened by the high priest's maid in the house of Caiaphas, had no fear of Rome the mistress of the world. It was the force of love that conquered the reasons for fear: and you did not think those to be feared whom you had undertaken to love. But this feeling of fearless affection you had even then surely conceived when the profession of your love for the Lord was confirmed by the mystery of the thrice-repeated question. And nothing else was demanded of this your earnest purpose than that you should bestow the food wherewith you had yourself been enriched, on feeding His sheep whom you loved.
Your confidence also was increased by many miraculous signs, by many gifts of grace, by many proofs of power. You had already taught the people, who from the number of the circumcised had believed: you had already founded the Church at Antioch, where first the dignity of the Christian name arose: you had already instructed Pontus, Galatia, Cappadocia, Asia, and Bithynia, in the laws of the Gospel message: and, without doubt as to the success of the work, with full knowledge of the short span of your life carried the trophy of Christ's cross into the citadel of Rome.
Then came also your blessed brother-Apostle Paul, the vessel of election, and the special teacher of the Gentiles, and was associated with you at a time when all innocence, all modesty, all freedom was in jeopardy under Nero's rule. Whose fury, inflamed by excess of all vices, hurled him headlong into such a fiery furnace of madness that he was the first to assail the Christian name with a general persecution, as if God's Grace could be quenched by the death of saints, whose greatest gain it was to win eternal happiness by contempt of this fleeting life. Precious, therefore, in the eyes of the Lord is the death of His saints: nor can any degree of cruelty destroy the religion which is founded on the mystery of Christ's Cross. Persecution does not diminish but increase the Church, and the Lord's field is clothed with an ever richer crop.
And over this band, dearly-beloved, whom God has set forth for our example in patience and for our confirmation in the faith, there must be rejoicing everywhere in the commemoration of all the saints, but of these two Fathers of excellence we must rightly make our boast in louder joy, for God's grace has raised them to so high a place among the members of the Church, that He has set them like the twin light of the eyes in the body, whose Head is Christ. About their merits and virtues, which pass all power of speech, we must not make distinctions, because they were equal in their election , alike in their toils, undivided in their death. But as we have proved for ourselves, and our forefathers maintained, we believe, and are sure that, amid all the toils of this life, we must always be assisted in obtaining God's mercy by the prayers of special interceders, that we may be raised by the Apostles' merits in proportion as we are weighed down by our own sins.